2. Pollutant transport i) Which stability criterion is lessening and worsening air pollution? Give brief explanation how air pollutants would be or would be not advected vertically. (4P) ii) Do a low-pressure or high-pressure system exacerbate an air pollution event? Why? (3P) 2. Pollutant transport i) Which stability criterion is lessening and worsening air pollution? Give brief explanation how air pollutants would be or would be not advected vertically. (4P) ii) Do a low- pressure or high-pressure system exacerbate an air pollution event? Why? (3P).